ModuleNotFoundError: No module named 'CommandNotFound'
问题解决如下：
而且，pip install时，还是出现了这个错误：
File"/usr/local/lib/python3.6/subprocess.py", line 418,in run output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command'('lsb_release', '-a')'returned non-zeroexitstatus 1.
终端运行lsb_release -a则是报错：
ModuleNotFoundError: Nomodulenamed'lsb_release'
解决方案：
找到lsb_release.py文件和CommandNotFound目录，把它们拷贝到报的错误中subprocess.py所在文件夹
命令如下：
sudo find / -name'lsb_release.py'
# result:
# /usr/share/pyshared/lsb_release.py
# /usr/lib/python2.7/dist-packages/lsb_release.py
# /usr/lib/python3/dist-packages/lsb_release.py
python -V
# Python 3.6.6
sudo cp /usr/lib/python3/dist-packages/lsb_release.py /usr/local/lib/python3.6/
